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mdtk - The MIDI Degradation Toolkit

Tools to generate datasets of Altered and Corrupted MIDI Excerpts -ACME datasets. Baseline models for cleaning the output from Automatic Music Transcription systems.

The accompanying paper, The MIDI Degradation Toolkit: Symbolic Music Augmentation and Correction, describes the toolkit and its motivation in detail. For instructions to reproduce the results from the paper, see the documentation ./docs/06_training_and_evaluation.ipynb.

Documentation

Documentation for the components of the toolkit is provided in ./docs

Overview

As a brief overview, the toolkit takes midi files as input and first converts them to a standard data structure like this:

onset	track	pitch	dur	velocity
0	0	100	250	80
250	0	105	255	100
250	1	100	100	95

where:

• onset is the time in milliseconds when a note began,
• track is the identifier for a distinct track in the midi file,
• pitch is the midinote pitch number ranging from 0 (C-2) to 127 (G9) (concert A4 is midinote 69), and
• dur is how long the note is held in milliseconds.
• velocity is the velocity of the note (defaults to 100 if not parsing from MIDI).

There are then functions to alter these files, introducing un-musical degradations such as pitch shifts.

The toolkit also contains modules to aid modelling, such as pytorch dataset classes for easy data loading.

For a more comprehensive overview, see the documentation avaialbe in ./docs

Install

We recommend using an environment manager such as conda, but you may omit these lines if you use something else. This install will allow you to both run all the scripts in this repository and use the toolkit in your own scripts (import mdtk). The requirements are described in the setup.cfg file.

git clone https://github.com/JamesOwers/midi_degradation_toolkit
cd midi_degradation_toolkit
conda update conda
conda create -n mdtk python=3.7
conda activate mdtk
pip install .

There are install options available:

# use pip install -e . for dev mode if you want to edit files
pip install -e ".[dev]"  # install everything
pip install -e ".[docs]"  # packages to rerun documentation
pip install -e ".[eval]"  # required for reproducing results from paper

Quickstart

To generate an ACME dataset simply install the package with instructions above and run python make_dataset.py.

For usage instructions for the measure_errors.py script, run python measure_errors.py -h you should create a directory of transcriptions and a directory of ground truth files (in mid or csv format). The ground truth and corresponding transcription should be named the exact same thing.

Training and evaluation code for the proposed modelling tasks is contained in ./baselines

Contributors

If you would like to contribute, please install in developer mode and use the dev option when installing the package. Additionally, please run pre-commit install to automatically run pre-commit hooks.

pip install -e "${path_to_repo}[dev]"
pre-commit install